Peroxisomes in duodenal epithelial cells proliferate under treatment of oral phytol (a component of chlorophyll) over the course of 3 days. Phytol is oxidized to phytanic acid and pristanic acid, which may be the ultimate inducers. The cytosol contains free ribosomes. RER, SER and mitochondria are also seen. Bar = 0.5 µm.
Mice received phytol in their food (http://www.nature.com/pr/journal/v20/n5/full/pr198694a.html ). Peroxisomes are contrasted with DAB at pH 10.5 by their catalase activity, after fixation in buffered formal-calcium. Postfixation in Os04.